Rack/src/random.cpp

#include <random.hpp>
#include <math.hpp>
#include <system.hpp>


namespace rack {
namespace random {


static Xoroshiro128Plus rng;


void init() {
	// Don't reset state if already seeded
	if (rng.isSeeded())
		return;

	// Get epoch time for seed
	double time = system::getUnixTime();
	uint64_t sec = time;
	uint64_t nsec = std::fmod(time, 1.0) * 1e9;
	rng.seed(sec, nsec);

	// Shift state a few times due to low seed entropy
	for (int i = 0; i < 4; i++) {
		rng();
	}
}


Xoroshiro128Plus& local() {
	return rng;
}


} // namespace random
} // namespace rack